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Search found 2012 results on 81 pages for 'impossible'.

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• When are you truly forced to use UUID as part of the design?

  - by Pyrolistical

  I don't really see the point of UUID. I know the probability of a collision is effectively nil, but effectively nil is not even close to impossible. Can somebody give an example where you have no choice but to use UUID? From all the uses I've seen, I can see an alternative design without UUID. Sure the design might be slightly more complicated, but at least it doesn't have a non-zero probability of failure. UUID smells like global variables to me. There are many ways global variables make for simpler design, but its just lazy design.

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• How to disable secret_token in Rails 3?

  - by Damian Nowak

  I have several separate Rails 2 applications which share the same cookie. I upgraded one the applications to Rails 3.2.15 now. Mandatory secret_token in Rails 3 makes it impossible to share the session with the Rails 2 apps. I am storing the session in Redis. What the visitor only gets in the cookie is a session ID. There's no need to encrypt it. Therefore, how to disable secret_token in Rails 3? A secret is required to generate an integrity hash for cookie session data. Use config.secret_token = "some secret phrase of at least 30 characters"in config/initializers/secret_token.rb

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• Can I programatically determine if a PNG is animated?

  - by alex

  I have PNG (as well as JPEG) images uploaded to my site. They should be static (i.e. one frame). There is such thing as APNG. (it will be animated in Firefox). According to the Wikipedia article... APNG hides the subsequent frames in PNG ancillary chunks in such a way that APNG-unaware applications would ignore them, but there are otherwise no changes to the format to allow software to distinguish between animated and non-animated images. Does this mean it is impossible to determine if a PNG is animated with code? If it is possible, can you please point me in the right direction PHP wise (GD, ImageMagick)?

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• How to develop a site for multiple browsers these days ?

  - by Misha Moroshko

  I would like to develop a site that works in all major browsers. I wonder what tools are available these days that may help me to check the functionality across browsers. I mean after I add some functionality to my site, I want to check it in all browsers. Are there any tools/software for this task ? I understand that it's impossible to check everything because it is pretty subjective if something works as expected or not, but maybe there are some tools that may found major errors (like IE is not supporting indexOf).

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• How To Get Type Info Without Using Generics?

  - by DaveDev

  Hi Guys I have an object obj that is passed into a helper method. public static MyTagGenerateTag<T>(this HtmlHelper htmlHelper, T obj /*, ... */) { Type t = typeof(T); foreach (PropertyInfo prop in t.GetProperties()) { object propValue = prop.GetValue(obj, null); string stringValue = propValue.ToString(); dictionary.Add(prop.Name, stringValue); } // implement GenerateTag } I've been told this is not a correct use of generics. Can somebody tell me if I can achieve the same result without specifying a generic type? If so, how? I would probably change the signature so it'd be like: public static MyTag GenerateTag(this HtmlHelper htmlHelper, object obj /*, ... */) { Type t = typeof(obj); // implement GenerateTag } but Type t = typeof(obj); is impossible. Any suggestions? Thanks Dave

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• How to decide which colors to use that look most similar across most screens/monitors?

  - by Lyon

  Hi, I'm baffled. I'm trying to find suitable colors for a logo that would look similar across most monitors/screens. I know it's near impossible, but how does one end up with the color palette that new Google logo and Facebook "blue" uses for example? I've a monitor that has been calibrated, and a few laptop screens that have default settings. Yet both the Google logo and facebook's look similar (although they aren't using colors restricted to the web safe 216 palette. Any ideas? thoughts? Thanks

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• Can a user-chosen image be inserted directly into a JEditorPane?

  - by JIM

  What I am trying to do is open up a JFilechooser that filters jpeg,gif and png images, then gets the user's selection and inserts it into the JEditorPane. Can this be done? or am i attempting something impossible? Here is a sample of my program.(insert is a JMenuItem and mainText is a JEditorPane) insert.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ JFileChooser imageChooser = new JFileChooser(); imageChooser.setFileFilter(new FileNameExtensionFilter("Image Format","jpg","jpeg","gif","png")); int choice = imageChooser.showOpenDialog(mainText); if (choice == JFileChooser.APPROVE_OPTION) { mainText.add(imageChooser.getSelectedFile()); } } }); What i tried to do is use the add method, i know it's wrong but just to give you an idea of what i'm trying to do. Before you complain, i'm sorry about the code formatting, i don't really know all the conventions of what is considered good or bad style. Thank you very much.

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• How to Detect a Right Click on Taskbar in WPF

  - by Zay

  I've got a WPF application in C# that starts off with a loading dialog. As expected, a button for the app shows up in the Windows taskbar. I would like to detect right-clicks that might be done to that button. Ultimately, I hope to disable the right-click or simply have the loading dialog regain focus. I've seen that some people use custom libraries and packages (interop, for example) to achieve some Win32 functionality, but I'd personally like to avoid this. Furthermore, these libraries/packages appear to be specific to Windows Forms; I've not seen anything for WPF. Is it impossible to manipulate the taskbar's right-click in WPF?

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• Output of ZipArchive() in tree format

  - by moustafa

  i have this list of files i get it by new ZipArchive(); i mean its in zip file now ths files docs/ docs/INSTALL.html docs/auth_api.html docs/corners_right.gif docs/corners_right.png docs/COPYING docs/corners_left.png docs/bg_header.gif docs/CHANGELOG.html docs/coding-guidelines.html docs/hook_system.html docs/FAQ.html docs/site_logo.gif docs/AUTHORS docs/README.html docs/corners_left.gif docs/stylesheet.css docs/New Folder/ docs/New Folder/New Text Document.txt docs/New Folder/New Folder/ i want code cut dir name from file and make it sub catgory i want it this docs/ INSTALL.html auth_api.html corners_right.gif corners_right.png COPYING New Folder/ New Text Document.txt New Folder/ New Folder/ I hope it's not impossible

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• Swapping an image during web development

  - by detly

  I'm trying to see what a certain webpage would look like if I replaced a certain image with another. Rather than upload the image, edit the site, etc, each time I tweak it, I'd like to know if there's a way to change the image in the page to my local version while viewing the remote page. I use Firebug for debugging web development usually, but I'm open to any other tool that might do this. (It is absolutely impossible to search for this and find anything but questions about dynamic image swapping on a deployed website, so sorry if this is a duplicate.)

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• Work with a local copy of the "master" SVN repo

  - by Werner

  Hi, at work, we have a SVN repo, which we access to thorugh http, like: svn co http://user@machine/PATH even at work and for some misterious reasons, teh connections between local machines and the repo machine are very slow, but the connection between home and work is almost impossible. I wonder if I could do somethin like: 1- get a copy of the "master" SVN repo to my local machine 2- each time i make modifications etc, use svn co http://user@MYLOCALmachine/PATH instead of svn co http://user@machine/PATH 3- when I am back at work, "merge" somehow all the modifications in my local repo to the master one. Sorry, I am ewally new to SVN, any hint would be appreciated. Thanks

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• What Are Basic Tools For A New Project?

  - by Morgan Cheng

  For a long time, I thought that to start a new project we only need 3 basic tools. 1) A Build System (e.g. Maven & CruiseControl) 2) A Version Control System (e.g. CVS & SVN & GIT) 3) A Bug Tracking System (e.g. Bugzilla) Yesterday, a senior guy told me that we need at least one thing more. That is KPI(Key Performance Index). Without KPI, it is impossible to measure whether the project is progressing well or not. KPI is kind of SOFT tool compared to Maven/SVN/Bugzilla. I believe since I missed SOFT tools, there must be some other kind of tools I missed. So, anybody get some ideas what other basic tools necessary for a new project?

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• Track mass email campaigns

  - by daeliur

  Litmus released an email analytics service last month (may 2010). See here: http://litmusapp.com/email-analytics They boast a very cool "read rate" tracking: they can track normal reads, Skims, and Glanced/Deleted. How can they track skims and glanced/deleted? This to me seems impossible :) They also track forwards and prints. Prints are easy (they include a css @media print query with a bg image). But forwards? I think this might be a combo between subsequent opens and different IPs/reffering URLs. However, this means that if I open my mail and re-read it from another computer, it counts as a forward. Any ideas on this one? To summarize: Litmus Email Analytics says they can track email reads, skims, glanced/deleted, prints and forwards. How do they do it (skims, glanced/deleted and forwards)?

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• Identifying iPhone OS's on a Network and Sending Push Notifications

  - by portalservices

  tldr; Can you identify devices on your network as an iPhone OS device easily? Can you send push notifications to devices identified as using the iPhone OS on your network without a a target app? Is is possible to identify which devices on a network are using the iPhone OS? With this information, is it possible to send push notifications to these devices? From my understanding, your application server will contact APNs, which will contact the users. So, the above would be impossible. Can someone confirm this for me? Thanks, P.S.

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• Are there any languages that are dynamically typed but do not allow weak typing?

  - by Maulrus

  For example, adding a (previously undeclared) int and a string in pseudocode: x = 1; y = "2"; x + y = z; I've seen strongly typed languages that would not allow adding the two types, but those are also statically typed, so it's impossible to have a situation like above. On the other hand, I've seen weakly typed languages that allow the above and are statically typed. Are there any languages that are dynamically typed but are also strongly typed as well, so that the piece of code above would not be valid?

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• Php wrapper class for XML

  - by gms8994

  I'm working on a new class to wrap XML handling. I want my class to use simplexml if it's installed, and the built in XML functions if it's not. Can anyone give me some suggestions on a skeleton class to do this? It seems "wrong" to litter each method with a bunch of if statements, and that also seems like it would make it nearly impossible to correctly test. Any upfront suggestions would be great! EDIT: I'm talking about these built-in xml functions.

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• Is it possible to use AsyncTask in a Service class ?

  - by Spredzy

  Everything is in the title. On the official documentations it is stated that Note that services, like other application objects, run in the main thread of their hosting process and AsyncTask only works if it is executed in the UIThread. So is it possible to use AsyncTask in a Service class? I am trying to do so but I'm always getting the same error 05-01 18:09:25.487: ERROR/JavaBinder(270): java.lang.ExceptionInInitializerError ... 05-01 18:09:25.487: ERROR/JavaBinder(270): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() Am I doing something wrong or is this just impossible ?

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• Making sure unsigned int/long always execute in checked context in C#

  - by theburningmonk

  Has anyone found it strange that the default context for uint and ulong is unchecked rather than checked considering that they are meant to represent values that can never be negative? So if some code is trying to violate that constraint it seems to me the natural and preferred behaviour would be to throw an exception rather than returning the max value instead (which can easily leave important pieces of data in an invalid state and impossible to revert..). Is there an existing attribute which can be applied to either class/assembly so that it always performs arithmetic operations in a checked context? I was thinking of writing one myself (as an aspect using PostSharp) but would be great if there's one already. Many thanks,

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• Is there any kind of standard for 8086 multiprocessing?

  - by Earlz

  Back when I made an 8086 emulator I noticed that there was the LOCK prefix intended for synchonization in a multiprocessor environment. Yet the only multitasking I know of for the x86 arch. involves use of the APIC which didn't come around until either the Pentiums or 486s. Was there any kind of standard for 8086 multitasking or was it done by some manufacturer specific extensions to the instruction set and/or special ports? By standard, I mean things like: How do you separate the 2 processors if they both use the same memory? This is impossible without some kind of way to make each processor execute a different piece of code. (or cause an interrupt on only one processor)

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• Using a ICollection Value in sqlite SELECT parameterized statment

  - by case23

  Im trying to get all the entrys from a sqlite Database which have the same name as the keys in a Hashtable. My Statement looks like this. // the keys from the hashtable are names equivalent // to name entrys in the SomeTable Names Collumn Hashtable names; String query = "SELECT Id, Name FROM SomeTable WHERE Name LIKE (@Names)"; SQLiteCommand command = new SQLiteCommand(query, _databaseConnection); command.Parameters.AddWithValue("@Names", names.Keys); SQLiteDataReader reader = reader.ExecuteReader(); while(reader.Read()) { Console.WriteLine("Name: {0}, ID: {1}", reader[1].ToString(), reader[0].ToString()); } Im totally sure there are similar values in the Database, but i get nothing back and the reader does not execute. Is it impossible to add a ICollection as a Parameter Value so i need to start the reader only one time?

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• K&R Exercise 1-21 - Mental incomprehension.

  - by asdfg

  The "impossible" K&R exercise. "Write a program entab that replaces strings of blanks by the minimum number of tabs and blanks to achieve the same spacing. Use the same tab stops, say every n columns. Should n be a variable or a symbolic parameter?" The problem I'm having is, I'm unsure about how to even do this correctly. I know it's not very explanatory, but that's pretty much the problem here. Most of the examples I've seen have counted a number of blanks, and replaced those series with a tab, but this isn't what its asking, I reckon I understand what its asking, but currently feel unable to do this. Could anyone help :)

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• Does the `Expires` HTTP header needs to be consistent across multiple cold-cache requests?

  - by chakrit

  I'm implementing a custom web server of a kind. And am looking into adding an Expires header support. However, I'm a little unsure of how exactly to implement it. If multiple cold-cache requests are being made to the same unchanged resource on the server and the server returned different Expires header (say it uses relative time to calculate the exact value of the Expires date e.g. +6 hours from the request time), does that invalidate the cache on all the proxy servers in-between as well? Or is it impossible to happen (per the spec)? Does the Expires HTTP header needs to be consistent across multiple cold-cache requests?

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• EventSetter - error XAML in Visual Studio designer

  - by pileggi

  Hi! I've done my TreeView all with XAML but now I'd like to manage an event with code-behind. The HierarchicalDataTemplate contains an Image. I need to capture the events MouseEnter / MouseLeave on the Image. I've tried in this way: <Image x:Name="imgArticolo" Source="{Binding imgArt}"> <Image.Style> <Style TargetType="{x:Type Image}"> <EventSetter Event="MouseEnter" Handler="iArt_MouseEnter"/> </Style> </Image.Style> </Image> But in the designer of Visual Studio appear the error: "Impossible to load a file XAML with EventSetter". How can I remedy? Thank you! Pileggi

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• How do I find useful code previously deleted but still stored in source control?

  - by sharptooth

  Whenever someone asks what to do with code that is no longer needed the answer is usually "delete it, restore it from source control if you need it back". Now how do I find that piece of source code in the repository? Let's limit scope to SVN for simplicity - I suspect that using any other source control system will not make much difference in this aspect (correct me if I'm wrong). If I delete that code and commit the changes it will no longer be in the latest revision. How do I find it without exporting each revision and searching thoroughly (which is nearly impossible)?

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• Running The JVM From Within An MXML Component

  - by Joshua

  Thinking outside of the box here... What possible basic approaches could be taken in an effort to create a Flex component that could run Java? I know I can easily use flex to browse to or launch a Java app, but there are things I can only do if I can run the Java from WITHIN an MXML Component. I the strictest sense, I know it's not impossible (ie: if you had all the source code for flex and for the jvm), but what's the least impractical means to this end? Showcase your creativity.

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